WO2021127849A1 - Lentille optique d'appareil de prise de vues - Google Patents

Lentille optique d'appareil de prise de vues Download PDF

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Publication number
WO2021127849A1
WO2021127849A1 PCT/CN2019/127463 CN2019127463W WO2021127849A1 WO 2021127849 A1 WO2021127849 A1 WO 2021127849A1 CN 2019127463 W CN2019127463 W CN 2019127463W WO 2021127849 A1 WO2021127849 A1 WO 2021127849A1
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Prior art keywords
lens
imaging optical
curvature
radius
image side
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PCT/CN2019/127463
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English (en)
Chinese (zh)
Inventor
卞旭琪
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诚瑞光学(常州)股份有限公司
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Priority to PCT/CN2019/127463 priority Critical patent/WO2021127849A1/fr
Publication of WO2021127849A1 publication Critical patent/WO2021127849A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/62—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having six components only

Definitions

  • the present invention relates to the field of optical lenses, in particular to an imaging optical lens suitable for portable terminal equipment such as smart phones and digital cameras, as well as imaging devices such as monitors and PC lenses.
  • the photosensitive devices of general photographic lenses are nothing more than photosensitive coupled devices (CCD) or complementary metal oxide semiconductor devices (Complementary Metal).
  • CCD photosensitive coupled devices
  • CMOS Sensor complementary metal oxide semiconductor devices
  • the pixel size of photosensitive devices has been reduced, and the development trend of current electronic products with good functions, thin and short appearance, therefore, has a good
  • the miniaturized camera lens with image quality has become the mainstream in the current market.
  • the lenses traditionally mounted on mobile phone cameras mostly adopt a three-element or four-element lens structure.
  • the purpose of the present invention is to provide an imaging optical lens that can meet the requirements of large aperture, ultra-thin and long focal length while obtaining high imaging performance.
  • the embodiments of the present invention provide an imaging optical lens.
  • the imaging optical lens includes in order from the object side to the image side: a first lens with positive refractive power, and a first lens with positive refractive power.
  • Two lenses a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power, and a sixth lens with negative refractive power;
  • the focal length of the imaging optical lens is f
  • the total optical length of the imaging optical lens is TTL
  • the focal length of the first lens is f1
  • the on-axis distance from the image side of the sixth lens to the image plane is BF, which satisfies The following relationship:
  • the radius of curvature of the object side surface of the fourth lens is R7
  • the radius of curvature of the image side surface of the fourth lens is R8, which satisfies the following relationship:
  • the focal length of the sixth lens is f6, which satisfies the following relationship:
  • the focal length of the first lens is f1
  • the radius of curvature of the object side of the first lens is R1
  • the radius of curvature of the image side of the first lens is R2
  • the on-axis thickness of the first lens is d1
  • the focal length of the second lens is f2
  • the radius of curvature of the object side of the second lens is R3
  • the radius of curvature of the image side of the second lens is R4
  • the on-axis thickness of the first lens is d3
  • the focal length of the third lens is f3
  • the radius of curvature of the object side of the third lens is R5
  • the radius of curvature of the image side of the third lens is R6, and the on-axis thickness of the third lens is d5 , Satisfies the following relationship:
  • the focal length of the fourth lens is f4
  • the on-axis thickness of the fourth lens is d7, and the following relationship is satisfied:
  • the focal length of the fifth lens is f5
  • the radius of curvature of the object side of the fifth lens is R9
  • the radius of curvature of the image side of the fifth lens is R10
  • the on-axis thickness of the fifth lens is d9
  • the radius of curvature of the object side surface of the sixth lens is R11
  • the radius of curvature of the image side surface of the sixth lens is R12
  • the axial thickness of the sixth lens is d11, which satisfies the following relationship:
  • the aperture F number of the imaging optical lens is less than or equal to 3.50.
  • the imaging optical lens according to the present invention has excellent optical characteristics, and has the characteristics of large aperture, long focal length, and ultra-thinness, and is especially suitable for being composed of high-pixel CCD, CMOS and other imaging elements.
  • FIG. 1 is a schematic diagram of the structure of an imaging optical lens according to a first embodiment of the present invention
  • FIG. 2 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 1;
  • FIG. 3 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 1;
  • FIG. 4 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 1;
  • FIG. 5 is a schematic diagram of the structure of an imaging optical lens according to a second embodiment of the present invention.
  • FIG. 6 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 5;
  • FIG. 7 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 5;
  • FIG. 8 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 5;
  • FIG. 9 is a schematic diagram of the structure of an imaging optical lens according to a third embodiment of the present invention.
  • FIG. 10 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 9;
  • FIG. 11 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 9;
  • FIG. 12 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 9.
  • FIG. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention.
  • the imaging optical lens 10 includes six lenses. Specifically, the imaging optical lens 10 includes in order from the object side to the image side: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens. Lens L6.
  • An optical element such as an optical filter GF may be provided between the sixth lens L6 and the image plane Si.
  • the first lens L1 is made of glass, and the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all plastic.
  • the focal length of the overall imaging optical lens 10 is defined as f, the focal length of the first lens L1 is f1, and the following relationship is satisfied: 0.70 ⁇ f1/f ⁇ 0.95, which specifies the ratio of the focal length f1 of the first lens L1 to the total focal length. It is conducive to ultra-thin system within the range of conditions.
  • the total optical length of the camera optical lens as TTL, and the on-axis distance from the image side of the sixth lens L6 to the image plane is BF, 0.35 ⁇ BF/TTL ⁇ 0.55.
  • TTL the total optical length of the camera optical lens
  • TTL the on-axis distance from the image side of the sixth lens L6 to the image plane
  • BF/TTL meets the conditions, it is beneficial to the system and electronic devices. assembly. Preferably, it satisfies 0.37 ⁇ BF/TTL ⁇ 0.55.
  • the radius of curvature of the object side surface of the fourth lens L4 as R7
  • the radius of curvature of the image side surface of the fourth lens L4 as R8, -10.00 ⁇ (R7+R8)/(R7-R8) ⁇ -1.50, specifying the fourth lens
  • the shape of L4 within the range specified by the conditional formula, can ease the deflection of light passing through the lens and effectively reduce aberrations.
  • it satisfies -9.98 ⁇ (R7+R8)/(R7-R8) ⁇ -1.52.
  • the focal length of the sixth lens L6 is defined as f6, -0.80 ⁇ f6/f ⁇ -0.50, which specifies the ratio of the focal length f6 of the sixth lens L6 to the focal length f of the system, which helps to improve the performance of the optical system within the scope of the conditional expression. Preferably, it satisfies -0.79 ⁇ f6/f ⁇ -0.50.
  • the imaging optical lens 10 of the present invention When the focal length of the imaging optical lens 10 of the present invention, the focal length of each lens, the refractive index of the relevant lens, the total optical length of the imaging optical lens, the axial thickness and the radius of curvature satisfy the above-mentioned relational expressions, the imaging optical lens 10 can be made to have a high Performance, and meet the design requirements of low TTL.
  • the object side surface of the first lens L1 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has positive refractive power.
  • the curvature radius R1 of the object side surface of the first lens L1 and the curvature radius R2 of the image side surface of the first lens L1 satisfy the following relationship: -8.26 ⁇ (R1+R2)/(R1-R2) ⁇ -2.59, which specifies the first lens
  • -8.26 ⁇ (R1+R2)/(R1-R2) ⁇ -2.59 which specifies the first lens
  • the shape of L1 is within the range specified by the conditional formula, as the lens develops toward an ultra-thin and longer focal length, it is beneficial to correct the problem of axial chromatic aberration.
  • the on-axis thickness of the first lens L1 is d1, which satisfies the following relationship: 0.05 ⁇ d1/TTL ⁇ 0.20, which is conducive to achieving ultra-thinness.
  • the object side surface of the second lens L2 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has positive refractive power.
  • the focal length of the second lens L2 is f2, which satisfies the following relationship: 0.42 ⁇ f2/f ⁇ 1.68.
  • the curvature radius R3 of the object side surface of the second lens L2 and the curvature radius R4 of the image side surface of the second lens L2 satisfy the following relationship: -7.47 ⁇ (R3+R4)/(R3-R4) ⁇ -1.10, which specifies the second lens
  • -7.47 ⁇ (R3+R4)/(R3-R4) ⁇ -1.10 which specifies the second lens
  • the shape of L2 is within the range, as the lens develops toward an ultra-thin and longer focal length, it is beneficial to correct the problem of axial chromatic aberration.
  • the on-axis thickness of the second lens L2 is d3, which satisfies the following relationship: 0.01 ⁇ d3/TTL ⁇ 0.10, which is beneficial to realize ultra-thinness.
  • the object side surface of the third lens L3 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has negative refractive power.
  • the focal length of the third lens L3 is f3, and satisfies the following relationship: -1.30 ⁇ f3/f ⁇ -0.36.
  • the system has better imaging quality and lower sensitivity.
  • the curvature radius R5 of the object side surface of the third lens L3 and the curvature radius R6 of the image side surface of the third lens L3 satisfy the following relationship: 0.62 ⁇ (R5+R6)/(R5-R6) ⁇ 2.47, which defines the shape of the third lens .
  • the degree of deflection of light passing through the lens can be eased, and aberrations can be effectively reduced.
  • the on-axis thickness of the third lens L3 is d5, which satisfies the following relationship: 0.01 ⁇ d5/TTL ⁇ 0.06, which is beneficial to realize ultra-thinness.
  • the object side surface of the fourth lens L4 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has positive refractive power.
  • the focal length f4 of the fourth lens L4 satisfies the following relational expression: 0.88 ⁇ f4/f ⁇ 9.13.
  • the reasonable distribution of optical power enables the system to have better imaging quality and lower sensitivity.
  • the on-axis thickness of the fourth lens L4 is d7, which satisfies the following relationship: 0.02 ⁇ d7/TTL ⁇ 0.14, which is beneficial to realize ultra-thinness.
  • 0.02 ⁇ d7/TTL 0.02 ⁇ d7/TTL ⁇ 0.11.
  • the object side surface of the fifth lens L5 is concave at the paraxial position, and the image side surface is convex at the paraxial position, and has positive refractive power.
  • the focal length f5 of the fifth lens L5 satisfies the following relationship: 0.41 ⁇ f5/f ⁇ 1.58.
  • the limitation of the fifth lens L5 can effectively make the light angle of the imaging lens smooth and reduce the tolerance sensitivity.
  • the curvature radius R9 of the object side surface of the fifth lens L5 and the curvature radius R10 of the image side surface of the fifth lens L5 satisfy the following relationship: 1.23 ⁇ (R9+R10)/(R9-R10) ⁇ 4.13, and the fifth lens L5 is specified
  • the shape is within the range of conditions, with the development of ultra-thin and long focal length, it is helpful to correct the aberration of the off-axis angle of view.
  • the on-axis thickness of the fifth lens L5 is d9, which satisfies the following relationship: 0.02 ⁇ d9/TTL ⁇ 0.14, which is beneficial to realize ultra-thinness.
  • 0.03 ⁇ d9/TTL 0.03 ⁇ d9/TTL ⁇ 0.11.
  • the object side surface of the sixth lens L6 is concave at the paraxial position, and the image side surface is concave at the paraxial position, and has a negative refractive power.
  • the curvature radius R11 of the object side surface of the sixth lens L6 and the curvature radius R12 of the image side surface of the sixth lens L6 satisfy the following relationship: -1.11 ⁇ (R11+R12)/(R11-R12) ⁇ 0.34, the sixth lens is specified
  • the shape of L6 is within the range of conditions, with the development of ultra-thin and long focal length, it is helpful to correct the aberration of the off-axis angle of view.
  • the on-axis thickness of the sixth lens L6 is d11, which satisfies the following relationship: 0.01 ⁇ d11/TTL ⁇ 0.08, which is beneficial to realize ultra-thinness.
  • the aperture F number of the imaging optical lens 10 is less than or equal to 3.50. Large aperture, good imaging performance. Preferably, the aperture F number of the imaging optical lens 10 is less than or equal to 3.43.
  • the overall optical length TTL of the overall imaging optical lens 10 can be shortened as much as possible, and the characteristics of miniaturization can be maintained.
  • the imaging optical lens 10 of the present invention will be described below with an example.
  • the symbols described in each example are as follows.
  • the unit of focal length, distance on axis, radius of curvature, thickness on axis, position of inflection point, and position of stagnation point is mm.
  • TTL The total optical length of the camera optical lens, in mm;
  • the object side and/or the image side of the lens can also be provided with inflection points and/or stagnation points to meet high-quality imaging requirements.
  • inflection points and/or stagnation points for specific implementations, refer to the following.
  • Table 1 and Table 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.
  • R The radius of curvature of the optical surface, and the radius of curvature of the center of the lens
  • R1 the radius of curvature of the object side surface of the first lens L1;
  • R2 the radius of curvature of the image side surface of the first lens L1;
  • R3 the radius of curvature of the object side surface of the second lens L2;
  • R4 the radius of curvature of the image side surface of the second lens L2;
  • R5 the radius of curvature of the object side surface of the third lens L3;
  • R6 the radius of curvature of the image side surface of the third lens L3;
  • R7 the radius of curvature of the object side of the fourth lens L4;
  • R8 the radius of curvature of the image side surface of the fourth lens L4;
  • R9 the radius of curvature of the object side surface of the fifth lens L5;
  • R10 the radius of curvature of the image side surface of the fifth lens L5;
  • R11 the radius of curvature of the object side surface of the sixth lens L6;
  • R12 the radius of curvature of the image side surface of the sixth lens L6;
  • R13 the radius of curvature of the object side surface of the optical filter GF
  • R14 the radius of curvature of the image side surface of the optical filter GF
  • d0 the on-axis distance from the aperture S1 to the object side of the first lens L1;
  • d2 the on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2;
  • d4 the on-axis distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;
  • d6 the on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4;
  • d10 the on-axis distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6;
  • d11 the on-axis thickness of the sixth lens L6;
  • d12 the on-axis distance from the image side surface of the sixth lens L6 to the object side surface of the optical filter GF;
  • d14 the on-axis distance from the image side surface of the optical filter GF to the image surface
  • nd refractive index of d-line
  • nd1 the refractive index of the d-line of the first lens L1;
  • nd2 the refractive index of the d-line of the second lens L2;
  • nd3 the refractive index of the d-line of the third lens L3;
  • nd4 the refractive index of the d-line of the fourth lens L4;
  • nd5 the refractive index of the d-line of the fifth lens L5;
  • nd6 the refractive index of the d-line of the sixth lens L6;
  • ndg the refractive index of the d-line of the optical filter GF
  • vg Abbe number of optical filter GF.
  • Table 2 shows the aspheric surface data of each lens in the imaging optical lens 10 of the first embodiment of the present invention.
  • k is the conic coefficient
  • A4, A6, A8, A10, A12, A14, and A16 are the aspheric coefficients.
  • the aspheric surface of each lens surface uses the aspheric surface shown in the above formula (1).
  • the present invention is not limited to the aspheric polynomial form represented by the formula (1).
  • Table 3 and Table 4 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 10 of the first embodiment of the present invention.
  • P1R1 and P1R2 represent the object side and image side of the first lens L1 respectively
  • P2R1 and P2R2 represent the object side and image side of the second lens L2 respectively
  • P3R1 and P3R2 represent the object side and image side of the third lens L3 respectively.
  • P4R1, P4R2 represent the object side and image side of the fourth lens L4
  • P5R1, P5R2 represent the object side and the image side of the fifth lens L5
  • P6R1, P6R2 represent the object side and the image side of the sixth lens L6, respectively.
  • the corresponding data in the “reflection point position” column is the vertical distance from the reflex point set on the surface of each lens to the optical axis of the imaging optical lens 10.
  • the data corresponding to the “stationary point position” column is the vertical distance from the stationary point set on the surface of each lens to the optical axis of the imaging optical lens 10.
  • FIG. 4 shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 10 of the first embodiment.
  • the field curvature S in FIG. 4 is the field curvature in the sagittal direction, and T is the field curvature in the meridian direction. song.
  • Table 13 shows the values corresponding to the various values in each of Examples 1, 2, and 3 and the parameters that have been specified in the conditional expressions.
  • the first embodiment satisfies various conditional expressions.
  • the imaging optical lens has an entrance pupil diameter of 4.247mm, a full field of view image height of 2.502mm, a diagonal field of view angle of 19.53°, a long focal length, ultra-thin, and its axis,
  • the off-axis chromatic aberration is fully corrected and has excellent optical characteristics.
  • the second embodiment is basically the same as the first embodiment, and the meaning of the symbols is the same as that of the first embodiment, and only the differences are listed below.
  • Table 5 and Table 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
  • Table 6 shows the aspheric surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
  • Table 7 and Table 8 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
  • FIG. 6 and 7 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm passes through the imaging optical lens 20 of the second embodiment.
  • FIG. 8 shows a schematic diagram of field curvature and distortion after light with a wavelength of 555 nm passes through the imaging optical lens 20 of the second embodiment.
  • the second embodiment satisfies various conditional expressions.
  • the entrance pupil diameter of the imaging optical lens is 4.182mm
  • the full field of view image height is 2.502mm
  • the diagonal field of view is 19.96°
  • long focal length ultra-thin
  • ultra-thin and its axis
  • the off-axis chromatic aberration is fully corrected and has excellent optical characteristics.
  • the third embodiment is basically the same as the first embodiment, and the meaning of the symbols is the same as that of the first embodiment, and only the differences are listed below.
  • Table 9 and Table 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
  • Table 10 shows the aspheric surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
  • Table 11 and Table 12 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 30 of the third embodiment of the present invention.
  • FIG. 10 and 11 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm pass through the imaging optical lens 30 of the third embodiment.
  • FIG. 12 shows a schematic diagram of field curvature and distortion after light with a wavelength of 555 nm passes through the imaging optical lens 30 of the third embodiment.
  • the imaging optical lens has an entrance pupil diameter of 4.818mm, a full field of view image height of 2.502mm, a diagonal field of view angle of 17.11°, a long focal length, ultra-thin, and its axis,
  • the off-axis chromatic aberration is fully corrected and has excellent optical characteristics.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

Une lentille optique d'appareil de prise de vues, comprenant du côté objet au côté image : une première lentille (L1) ayant une réfringence positive, une deuxième lentille (L2) ayant une réfringence positive, une troisième lentille (L3) ayant une réfringence négative, une quatrième lentille (L4) ayant une réfringence positive, une cinquième lentille (L5) ayant une réfringence positive et une sixième lentille (L6) ayant une réfringence négative, et les relations suivantes sont satisfaites : 0,70 ≤ f1/f ≤ 0,95 et 0,35 ≤ BF/TTL ≤ 0,55.
PCT/CN2019/127463 2019-12-23 2019-12-23 Lentille optique d'appareil de prise de vues WO2021127849A1 (fr)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140043662A1 (en) * 2012-08-08 2014-02-13 Hirotoshi NAKAYAMA Scanner lens, image reader and image forming device
CN108241200A (zh) * 2016-12-26 2018-07-03 三星电机株式会社 光学成像系统
CN108681041A (zh) * 2018-04-26 2018-10-19 瑞声科技(新加坡)有限公司 摄像光学镜头
CN109073861A (zh) * 2016-04-15 2018-12-21 苹果公司 成像透镜系统
CN109856772A (zh) * 2018-12-27 2019-06-07 瑞声科技(新加坡)有限公司 摄像光学镜头
CN109856773A (zh) * 2018-12-27 2019-06-07 瑞声科技(新加坡)有限公司 摄像光学镜头
CN110187472A (zh) * 2014-11-18 2019-08-30 三星电机株式会社 镜头模块

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140043662A1 (en) * 2012-08-08 2014-02-13 Hirotoshi NAKAYAMA Scanner lens, image reader and image forming device
CN110187472A (zh) * 2014-11-18 2019-08-30 三星电机株式会社 镜头模块
CN109073861A (zh) * 2016-04-15 2018-12-21 苹果公司 成像透镜系统
CN108241200A (zh) * 2016-12-26 2018-07-03 三星电机株式会社 光学成像系统
CN108681041A (zh) * 2018-04-26 2018-10-19 瑞声科技(新加坡)有限公司 摄像光学镜头
CN109856772A (zh) * 2018-12-27 2019-06-07 瑞声科技(新加坡)有限公司 摄像光学镜头
CN109856773A (zh) * 2018-12-27 2019-06-07 瑞声科技(新加坡)有限公司 摄像光学镜头

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